BATC Wiki - Recent changes [en-gb]

The Muntjac SDR

G4EWJ — Wed, 06 May 2026 14:09:38 GMT

File:Muntjac4 pico-1v0p-uf2.zip

G4EWJ — Mon, 04 May 2026 15:25:20 GMT

G4EWJ uploaded File:Muntjac4 pico-1v0p-uf2.zip Muntjac firmware .uf2 file.

New page

== Summary ==
Muntjac firmware .uf2 file.

The Muntjac SDR

G4EWJ — Mon, 04 May 2026 15:09:53 GMT

Programming the Microcontroller on the Muntjac

File:Portsdown-info-screen2.png

G4EWJ — Mon, 04 May 2026 14:46:39 GMT

G4EWJ uploaded File:Portsdown-info-screen2.png Portsdown info screen for Muntjac.

New page

== Summary ==
Portsdown info screen for Muntjac.

The Muntjac SDR

G4EWJ — Mon, 04 May 2026 14:41:51 GMT

Programming the Microcontroller on the Muntjac

File:Muntjac-virtual-drive2.png

G4EWJ — Mon, 04 May 2026 14:06:17 GMT

G4EWJ uploaded File:Muntjac-virtual-drive2.png Muntjac virtual drive on a PC.

New page

== Summary ==
Muntjac virtual drive on a PC.

File:Muntjac-virtual-drive1.png

G4EWJ — Mon, 04 May 2026 14:00:39 GMT

G4EWJ uploaded File:Muntjac-virtual-drive1.png Muntjac virtual drive on a PC.

New page

== Summary ==
Muntjac virtual drive on a PC.

The Muntjac SDR

G4EWJ — Mon, 04 May 2026 09:39:01 GMT

Muntjac Input/Output Connectors

The Muntjac SDR

G8GKQ — Sun, 03 May 2026 18:24:11 GMT

Using the Third Harmonic of the Low Band for DATV on 23cm

The Muntjac SDR

G4EWJ — Sun, 03 May 2026 17:23:13 GMT

Programming the Microcontroller on the Muntjac

@@ Line 15: / Line 15: @@
 Please put any comments, questions or problems on the BATC Muntjac forum: '''https://forum.batc.org.uk/viewforum.php?f=148'''
 [[File:cqtvmj25-1a.jpg|400px]] [[File:cqtvmj25-2a.jpg|400px]]
@@ Line 220: / Line 221: @@
-===Programming the Microcontroller on the Muntjac===
+===Programming the Muntjac Microcontroller===
 Muntjacs are provided pre-programmed by the BATC Shop, but this is the procedure to load a firmware update if required.
-. Locate the latest compiled firmware file 'muntjac4_pico-1v**.uf2' which will be found here https://github.com/davecrump/portsdown4/blob/master/src/muntjac/muntjac4_pico-1v0p.uf2 and save it to your desktop.
+. Download the latest compiled firmware in this zip file onto the PC desktop and unzip it: '''[[Media:muntjac4_pico-1v0p-uf2.zip|muntjac4_pico-1v0p-uf2.zip]]'''
 . Hold down the BT button (the one nearer to the SMA sockets) on the Muntjac while connecting it to your PC using its USB port.
 . The Muntjac should now appear as a new drive connected to the PC. Your drive letter may be different. The drive name will be RPI-RP2 and there will be 2 files in it: INDEX.HTM and INFO_UF2.TXT
@@ Line 232: / Line 241: @@
 [[File:Muntjac-virtual-drive2.png|800px]]
-Drag the muntjac4_pico-1v**.uf2 file that you saved onto the desktop in step 1 above, to the RPI-RP2 drive. The transfer should take about 5 seconds.
+Drag the '''muntjac4_pico-1v0p.uf2''' file that you unzipped in step 1 above (not the zip file itself, or the folder it was unzipped into), to the RPI-RP2 drive. The transfer should take about 5 seconds.
 The RPI-RP2 drive will then disappear and the Muntjac will restart itself.
@@ Line 263: / Line 272: @@
 [[File:MJputty1.png|400px]]
 ===Updating the Muntjac Firmware Using a Portsdown===

@@ Line 189: / Line 189: @@
 Some Muntjacs may have been calibrated before sale.  The calibration files for these are included in the latest Portsdown software, and the correct file is loaded when the Muntjac is registered using the procedure above.  However, some may not have been factory calibrated (although they will have been tested).  They will function perfectly well for DATV without this file.  A tool is under development to enable the Muntjac calibration file to be generated by the user.
-The Muntjac calibration file has a file name of the format E46214B063533828.mjo where the E number is the ID of the flash memory chip on the Muntjac.  A file of the correct format with the correct name in the /home/pi/rpidatv/bin/ folder is automatically read by the Muntjac driver and the settings applied.  The library of files is in the folder /home/pi/rpidatv/src/muntjac.  If you would like your calibration file added to this library, please e-mail it to G8GKQ.  An example file can be found at https://github.com/davecrump/portsdown4/blob/master/src/muntjac/E46214B063533828.mjo.
+The Muntjac calibration file has a file name of the format E46214B063533828.mjo where the E number is the serial number of the flash memory chip on the Muntjac.  A file of the correct format with the correct name in the /home/pi/rpidatv/bin/ folder is automatically read by the Muntjac driver and the settings applied.  The library of files is in the folder /home/pi/rpidatv/src/muntjac.  If you would like your calibration file added to this library, please e-mail it to G8GKQ.  An example file can be found at https://github.com/davecrump/portsdown4/blob/master/src/muntjac/E46214B063533828.mjo.
 ===Output Filtering===
@@ Line 226: / Line 226: @@
 . Locate the latest compiled firmware file 'muntjac4_pico-1v**.uf2' which will be found here https://github.com/davecrump/portsdown4/blob/master/src/muntjac/muntjac4_pico-1v0p.uf2 and save it to your desktop.
-. Hold down the BT button (the one nearest the SMA sockets) on the Muntjac while connecting it to your PC using its USB port.
+. Hold down the BT button (the one nearer to the SMA sockets) on the Muntjac while connecting it to your PC using its USB port.
-. The Muntjac should now appear as a new drive connected to the PC. The volume name will be RPI-RP2 and there will be 2 files in it: INDEX.HTM and INFO_UF2.TXT
+. The Muntjac should now appear as a new drive connected to the PC. Your drive letter may be different. The drive name will be RPI-RP2 and there will be 2 files in it: INDEX.HTM and INFO_UF2.TXT
 [[File:Muntjac-virtual-drive2.png|800px]]
@@ Line 240: / Line 240: @@
 On the Muntjac, the main LED near the buttons will blink 'MJ' plus the last letter of the new firmware version. The LED will go out for a few seconds while the Muntjac is initialising and then light steady.
-. Disconnect the Muntjac from the PC and connect it to the Portsdown. Wait until the main LED on the Muntjac is on and steady.
+. Disconnect the Muntjac from the PC and connect it to the Portsdown. Wait until the main LED on the Muntjac is lit and steady.
-Make sure that "Output to" on the Portsdown main menu is set to Muntjac. If this is the first time that this Muntjac has been connected to this Portsdown, change "Output to" to something other than "Muntjac" and then back to "Muntjac". The Portsdown will recognise a new Muntjac and the Portsdown will reboot itself as part of the Muntjac registration process.
+Make sure that "Output to" on the Portsdown main menu is set to "Muntjac". If this is the first time that this Muntjac has been connected to this Portsdown, while the Muntjac is connected to the Portsdown, change "Output to" to something other than "Muntjac" and then back to "Muntjac". The Portsdown will recognise a new Muntjac and the Portsdown will reboot itself as part of the Muntjac registration process.
-When the main LED on the Muntjac is lit steady, on the Portsdown, select "M2" and "Info" and the Muntjac firmware version and serial number will be displayed as shown below.
+When the Portsdown has rebooted and the main LED on the Muntjac is lit and steady, on the Portsdown select "M2" and "Info" and the Muntjac firmware version and serial number will be displayed as shown below.
 ===Alternative Method of Putting the Microcontroller into Firmware Update Mode===

@@ Line 226: / Line 226: @@
 . Locate the latest compiled firmware file 'muntjac4_pico-1v**.uf2' which will be found here https://github.com/davecrump/portsdown4/blob/master/src/muntjac/muntjac4_pico-1v0p.uf2 and save it to your desktop.
-. Hold down the BT button (the one nearest the SMA sockets) on the Muntjac while connecting it to your PC using its USB port. The Pico Muntjac appears as a USB disk drive on your PC.
+. Hold down the BT button (the one nearest the SMA sockets) on the Muntjac while connecting it to your PC using its USB port.
-. Copy the .uf2 file onto the USB drive. The transfer should take about 5 seconds. The Muntjac will recognise the file and immediately update its firmware, reboot and the PC should recognise a new USB COM device. The main LED on the Muntjac will blink in morse as it reboots. This will be 'HI' for firmware version 1v0b and "MJ" plus the last letter of the firmware version for later versions of the firmware. The main LED will then go off for a few seconds while Muntjac is initialising and then light steady.
+. The Muntjac should now appear as a new drive connected to the PC. The volume name will be RPI-RP2 and there will be 2 files in it: INDEX.HTM and INFO_UF2.TXT
-. Disconnect the Muntjac from the PC and connect it to the Portsdown.  Make sure that the Muntjac is selected as the Output Device and then Select M2, Info.  The Muntjac firmware version will be displayed along with the Muntjac Flash ID.
+[[File:Muntjac-virtual-drive2.png|800px]]
 ===Alternative Method of Putting the Microcontroller into Firmware Update Mode===

@@ Line 8: / Line 8: @@
 The optional user-fitted ADE-30+ mixer is shown, which can be used for experiments on other bands. DATV is generated on the high band and mixed with the harmonic of a carrier on the low band. In theory, output on all bands from 1.8MHz to 3.4GHz is possible, but this is subject to further investigation.
 Muntjac-4 was meant to be intermediate development version, but it is working well enough to make it available as part of an extended beta trial. Some configuration in Linux may be necessary, so if you don't consider yourself to be an 'early-adopter' it may be worth waiting until it has matured.
@@ Line 124: / Line 126: @@
 There is a main LED near the buttons and an LED near each SMA socket.
-The main LED blinks 'HI' in morse (.... ..) at power up. This is for software version 1v0b. Later versions will blink 'MJ' and the last letter of the software version. After a few seconds for initialisation, the main LED will light steady.
+The main LED blinks 'HI' in morse (.... ..) at power up. This is for firmware version 1v0b. Later versions will blink 'MJ' and the last letter of the firmware version. After a few seconds for initialisation, the main LED will light steady.
 The LED near each SMA socket is normally off and lights when that band (low or high) is in use.
@@ Line 187: / Line 189: @@
 Some Muntjacs may have been calibrated before sale.  The calibration files for these are included in the latest Portsdown software, and the correct file is loaded when the Muntjac is registered using the procedure above.  However, some may not have been factory calibrated (although they will have been tested).  They will function perfectly well for DATV without this file.  A tool is under development to enable the Muntjac calibration file to be generated by the user.
-The Muntjac calibration file has a file name of the format E46214B063533828.mjo where the E number is the flash ID of the RP2040 chip.  A file of the correct format with the correct name in the /home/pi/rpidatv/bin/ folder is automatically read by the Muntjac driver and the settings applied.  The library of files is in the folder /home/pi/rpidatv/src/muntjac.  If you would like your calibration file added to this library, please e-mail it to G8GKQ.  An example file can be found at https://github.com/davecrump/portsdown4/blob/master/src/muntjac/E46214B063533828.mjo.
+The Muntjac calibration file has a file name of the format E46214B063533828.mjo where the E number is the ID of the flash memory chip on the Muntjac.  A file of the correct format with the correct name in the /home/pi/rpidatv/bin/ folder is automatically read by the Muntjac driver and the settings applied.  The library of files is in the folder /home/pi/rpidatv/src/muntjac.  If you would like your calibration file added to this library, please e-mail it to G8GKQ.  An example file can be found at https://github.com/davecrump/portsdown4/blob/master/src/muntjac/E46214B063533828.mjo.
 ===Output Filtering===
@@ Line 242: / Line 244: @@
 . Proceed with step 3 in the section above.
-Note that this depends on the software already in the Muntjac being configured to do this. This approach would not work on a blank Raspberry Pi Pico board, which uses the same RP2040 microcontroller as the Muntjac.
+Note that this depends on the firmware already in the Muntjac being configured to do this by the SDK (software development kit). This approach would not work on a blank Raspberry Pi Pico board, which uses the same RP2040 microcontroller as the Muntjac.
 [[File:MJputty1.png|400px]]
 ===Updating the Muntjac Firmware Using a Portsdown===
@@ Line 270: / Line 271: @@
 |+ Mixing Options
 |-
-! Output !! Low !! Harmonic !! High
+! Target !! Low !! Harmonic !! High
 |-
 | 3400-3410 || 1010 || - || 2390-2400
@@ Line 316: / Line 317: @@
 ===Muntjac Input/Output Connectors===
-The 40 pin J101 position will allow the Muntjac to connect directly to a Raspberry Pi. This will provide power and also an SPI link, which will allow higher data rates for future development. It is recommended that no connector is fitted here until the required orientation and gender is known.
+The 40 pin J101 position will enable the Muntjac to connect directly to a Raspberry Pi. This will provide power and also an SPI connection instead of USB, allowing higher data rates for future development. It is recommended that no connector is fitted here until the required orientation and gender is known.
 The 8 pin J3 position can be used for general I/O or to allow future developments to connect a WIZnet Ethernet module for applications that do not require a Raspberry Pi.
@@ Line 322: / Line 323: @@
 The 12 pin J4 position is for general I/O.
-.3v power is available on J3 and J4. The available current is yet to be determined.
+.3v power is available on J3 and J4. The available current is yet to be determined, but likely to be around 100mA.
 All Muntjac I/O pins on J3 and J4 are connected directly to the RP2040 microcontroller, so caution should be exercised regarding static and voltage levels. 3.3v is the nominal voltage level.
@@ Line 330: / Line 331: @@
 ===Problems===
-The Muntjac may not be seen as a USB COM port when connected to a USB3 hub. The USB3 sockets on the RPi4 are not a problem. However, it will appear as a virtual USB drive for software update when connected to a USB3 hub, which is odd.
+The Muntjac may not be seen as a USB COM port when connected to a USB3 hub. The USB3 sockets on the RPi4 are not a problem. However, it will appear as a virtual USB drive for firmware update when connected to a USB3 hub, which is odd.
 <!--

@@ Line 295: / Line 295: @@
 ===Using the Third Harmonic of the Low Band for DATV on 23cm===
-The third hamonic of 418.333 MHz can be used to transmit on 1255 MHz.  The third harmonic is about 20 dB down on the fundamental, so good filtering is required.  More details will appear here.
+The third harmonic of 418.333 MHz can be used to transmit on 1255 MHz.  The third harmonic is about 20 dB down on the fundamental, so good filtering is required.  More details will appear here.
 [[File:Third Harmonic.jpg|400px]]